32056 bearing: complete specifications & equivalents

Specification table

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB) · extracted 2026-09-28

Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.

Cross references & equivalents

Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.

How the 32056 model number is decoded

Ordering number SKF 32056 X in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 280 mm shaft, low-friction section, with an open pressed-steel-cage execution and one-direction axial capacity.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 20 is the ISO 355 diameter/width series (low-friction section), and the last two digits encode the 280 mm bore; the 420 mm OD and 87 mm width follow the ISO 355 general plan. In SKF suffix language a bare 32056 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. With C 1288 kN and C0 2360 kN, the 32056 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 1,300 r/min. Fit selection follows the rotating ring — interference on a rotating cone — and two 32056 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair. Speed envelope and thermal behaviour: at 1,000 r/min thermal reference, the 280 mm bore shaft runs at a dn of 280k, and the 70.0 mm section dissipates heat through the cup-to-housing contact path; the 1,300 r/min mechanical ceiling reflects cage strength, and the 40500 g spinning cone contributes gyroscopic moment under rapid speed reversal.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• At 280 mm bore the cone mass is high enough that cocking during mounting damages the cage and rib; guide the ring square, confirm seat contact around the full circumference, and re-check setting after the first thermal cycle of the paired set.
• The 320 series at 280 mm bore (420×87 mm) is the low-friction, higher-speed section; it carries less thrust than a 30256 of the same bore, so verify the axial load share before swapping.
• At the 1288 kN rating of 32056, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 1,300 r/min speed end and heavier preload only where moment stiffness dominates.
• The tapered contact angle creates an induced axial load under pure radial force; include it in the 32056 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.
• Open 32056 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.
• The 1288/2360 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.
• SKF lists several executions of 32056 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 32056 X designation when purchasing and match the execution to the mounting arrangement.